diff --git a/ccompiler.mac64.osx.gcc b/ccompiler.mac64.osx.gcc
index 669f962..6582043 100644
--- a/ccompiler.mac64.osx.gcc
+++ b/ccompiler.mac64.osx.gcc
@@ -4,13 +4,13 @@
 #  C compilation and loading
 #
 
-CC=gcc-12
+CC=gcc-13
 CCBASIC='-c -std=c11 -fPIC'
 CCISO='-ansi -pedantic' # -pedantic-errors'
 CCDEBUG= #-g -DDEBUG_GALAHAD
 CCFFLAGS=-lgfortran
 
-CXX=g++-12
+CXX=g++-13
 CXXBASIC='-c -std=c++11 -fPIC -I/opt/homebrew/include'
 CXXOPT=-O2
 CXXNOOPT=-O0